Amanda Bynes has denied playing any part in posting a series of tweets attacking Rihanna that were sent from her own Twitter account.

The tweets were sent over the weekend kicking things off with, “Chris Brown beat you because you’re not pretty enough.”

During the tirade, Rihanna quickly quipped, “Ya see what happens when they cancel Intervention?” which appeared to aggravate the situation.

Today the Nickelodeon star claimed the tweets were ‘mocked up’ and that her and Rihanna were sure to star in a music video one day.

She also decided to address rumours that she is a drug-taker and alcoholic and said there are no drugs or alcohol in her system. She threatened to sue anyone who had suggested otherwise.

Amanda has been hitting headlines recently for crazy behaviour involving yet more bizarre tweets, throwing a bong out of a window – despite insisting she is allergic to marijuana – and accusing a police officer of sexually harassing her.

Her family have expressed their concern for her recently but Amanda rejected them on Twitter and explained she has cut off all communication for them.

Her family have pushed for her to see a psychiatrist amid fears she is suffering from schizophrenia however Amanda insists she is not mentally ill.